Two-cycle internal-combustion engine



, July 18, 1950 E. A. TALVIO TWO-'CYCLE INTERNAL-COMBUSTION ENGINE 2 Sheets-Sheet 1 Filed June 9, 1948 Erik Albert Ta/w'a July 18, 1950 E. A. TALVIO ,0

TWO-CYCLE INTERNAL-COMBUSTION ENGINE Filed June 9, 1948 2 Sheets-Sheet 2 Inventor E rik Albert Ta/w'o rennin-Jul is, 1950 TWO-CYCLE INTERNAL- COMBUSTION ENGINE Erik Albert Talvio, ,Helsingfors, Finland, assignor of. fifty per. cent to William .Stepanoff, .San.

Francisco, ,Calif.

Application-dune 9, 1948', Serial No'. 31',895-

' 5,.Claims. (Cl. 123-73) The1 present, invention; relates generally to .ine

ternal combustion engines ,andmore 1particularly to a two-cycle internal combustion-engine characterizedby having the inletas ,well astha-outlet port in, the,.wal1 of the cylinder, adjacent each, other whereby, the .efficiency, of the {engine is in-.

tion of the engine is simplified, the weight of the engina-is-reduced, and the engine more compactly built. U

A still further objectis to provide a device of this character which is efiicient and'reliable in operation, relatively inexpensive to manufacture and *otherwise well adapted for the purposes for which the sameisintended.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference beinghad to the accompanying drawings forming parthereof,"wherein like numerals refer to like parts throughout, and in which:

Figure l is a vertical sectional view of the engine.

Figure 2 is a side elevational view of the engine cylinder with the combined inlet and exhaust manifold removed therefrom.

Figure 3 is a plan view of the inner side of the manifold.

Figure 4 is a longitudinal sectional view of the engine cylinder.

Figure 5 is a transverse sectional View taken substantially on a line 55 of Figure 4.

Figure 6 is a side elevational view of the engine.

Referring now to the drawings in detail wherein, for the purpose of illustration, I have disclosed a preferred embodiment of the invention, the numeral 5 designates a cylinder of an internal combustion engine suitably secured to a crankcase 6, the engine being of the two-cycle type. The engine piston is shown at l connected to a crank shaft 8 in the usual manner by a piston rod 9.

One side of the cylinder 5 is formed with a flat surface I0 provided with a pair of exhaust ports II and I2 connected to the cOmbustiQnchamber.

I3 of the cylinderby passages Ill and I5.,

Positioned between the exhaustports I I and I2 and one. horizontal plane therewith is a group of inlet ports -I 6. A second group of lower inlet ports I'l is also formed in thefiat surface III of the cylinder below or. longitudinally inwardly of the group of inletports I6.

A combined inlet and outlet manifold plate I8.

is suitably secured to the flat-surface H] of the cylinder. andis formed with exhaust passages I9; and 20 connected respectively to exhaust ports I I and I2. and merging as at 2| for attaching a.

single exhaust pipe (not shown) thereto.

The upper inlet ports I61 are inclined downwardly toward. a trough-shaped concaved ,upper surface 22 of piston l and the manifold plate I8 is formed with a plurality of curved vertical passages 23 having their upper ends connected to the upper inlet ports IS and their lower ends connected to the lower inlet ports Il. The troughshaped concavity 22 on top of piston! extends transversely thereof and at each side of the concavity is a recess 24 in the top of the piston and extending. into the wall thereof for registry with the respective exhaust passages l4 and I5.

The skirt of piston l is formed with openings. 2-5 .which register with the lower group ofinlet ports I I when the. piston reaches its extreme lower position, as shown in Figures 1 and 4.

In the operation of the device, fuel is supplied. to the crankcase in any suitable manner and is;

admitted to the combustion chamber by way of openings 25 in the piston, lower group of inlet ports I1, passages 23, and upper group of inlet ports I6, when the piston is in its extreme lower position.

The burnt gases are exhausted by way of exhaust ports II and I2 and passages I9 and 29, the recesses 24 in the top side edges of the piston registering with the exhaust ports enabling eflicient scavenging of the combustion chamber.

The downwardly inclined inlet ports it direct the fuel downwardly into the trough-shaped concavity on top of the piston to keep the piston free of the accumulation of carbon.

In view of the foregoing description taken in conjunction with the accompanying drawings, it is believed that a clear understanding of the device will be quite apparent to those skilled in this art. A more detailed description is accordingly deemed unnecessary.

It is to be understood, however, that even though there is herein shown and described a preferred embodiment of the invention, the same is susceptible to certain changes fully comprehended by the spirit of the invention as herein described and within the scope of the appended claims.

Having described the claimed as new is:

1. In a two-cycle internal combustion engine, a cylinder having upper and lower groups of inlet ports in one side positioned respectively above and below a piston working in the cylinder durinvention, what ing movements of the piston intoits opposite po- 7 sitions, a pair of exhaust ports in the cylinder at the sides of said upper group of inlet ports, and a combined inlet and exhaust manifold plate attached to the cylinder and having inlet and exhaust passages therein connected respectively to the inlet and exhaust ports, said inlet passages connecting the upper and lower groups of inlet ports to each other.

2. In a two-cycle internal combustion engine, a cylinder having upper and lower groups of inlet ports in one side positioned respectively above and below a piston working in the cylinder during movements of the piston into its opposite positions, a pair of exhaust ports in the cylinder at the sides of said upper group of inlet ports, and a combined inlet and exhaust manifold plate attached to the cylinder and having inlet and exhaust passages therein connected respectively to the inlet and exhaust ports, said upper group of inlet ports being inclined downwardly into the cylinder and said inlet passages connecting the upper and lower groups of inlet ports to each other.

3. In a two-cycle internal combustion engine, a cylinder having a piston working therein and provided with a central concaved top and recesses in its upper edge at opposite sides of the concaved portion, said cylinder also having upper and lower groups of inlet ports in one side positioned respectively above and below the piston during its movement in opposite directions, and a pair of exhaust ports at opposite sides of the upper group of inlet ports, said upper group of inlet ports being inclined downwardly toward the concaved top of the piston and said exhaust ports registering with the recesses when the piston is moved downwardly, and a combined inlet and exhaust manifold plate attached to the cylinder and having inlet and exhaust passages 50 therein connected respectively to the inlet and exhaust ports, said inlet passages connecting the 4 upper and lower groups of inlet ports to each other.

4. In a two-cycle internal combustion engine, a cylinder having a piston working therein, said piston having a trough-shaped top extending substantially across the top and a recess in the upper edge of the piston at each side of the trough and adjacent one end of the trough, said cylinder also having upper and lower groups of inlet ports in one side positioned respectively above and below the piston during its movement in opposite directions, and a pair of exhaust ports at opposite sides of the upper group of inlet ports, said upper group of inlet ports being inclined downwardly toward the trough of the piston and said exhaust ports registering with the recesses when the piston is moved downwardly, and a combined inlet and exhaust manifold plate attached to the cylinder and having inlet and exhaust passages therein connected respectively to the inlet and exhaust ports, said inlet passages connecting the upper and lower groups of inlet ports to each other.

5. In a two-cycle internal combustion engine, a cylinder having a piston working therein and provided with openings in its skirt, said cylinder having a pair of exhaust ports in one side, an upper group of inlet ports between the exhaust ports, and a lower group of inlet ports, said lower group of inlet ports registering with the openings in the piston upon reaching its extreme lower position, and a, combined inlet and exhaust manifold plate secured to the cylinder and having exhaust passages leading from the exhaust ports, and inlet passages connecting the upper and lower groups of inlet ports.

ERIK ALBERT TALVIO.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS France of 1937 

